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Staurastrum alternans Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Desmidiaceae

Staurastrum alternans J. Ralfs 1848

Ralfs’ (1848: 132, Pl. 21: 7) original description was poorly figures so the concept of the species presented by West & West (1912: 170, pl 126: 8-9) has been adopted. It’s closely related to S. dilatatum and S. striolatum and is regarded as a problematic complex. The zygospores of this complex are virtually identical.
It’s infrequently recorded in oligo-mesotrophic habitats such as moorland pools and loch-margins. It has also been found with bryophytes on wet rocks. It can be found in slightly acidic to slightly alkaline habitats.
Cell dimensions: L: 20-30 µm; B: 20-30 µm; Is: 7.0-8.0.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Ralfs, J. (1848) The British Desmidieae.
West, W. & West, G.S. (1912) A Monograph of the British Desmidiaceae, Volume 4.

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